package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {
    /**
     * 新增套餐，同时保存套餐和菜品的关联关系
     * @param setmealDto
     */
    @Autowired
    private SetmealDishService setmealDishService;

    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息,操作setmeal，执行insert语句
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item)->{
            item.setSetmealId(setmealDto.getId());
            return item;

        }).collect(Collectors.toList());
        //保存套餐和菜品的关联信息，操作setmeal_dish执行insert语句
        setmealDishService.saveBatch(setmealDishes);
    }
    /**
     * 删除套餐以及关联的菜品
     * @param ids
     */
    @Override
    @Transactional
    public void removeWithDish(List<Long> ids) {
        //停售套餐才能删除，先查询套餐状态
        //delete from setmeal where id in(*,*,*） and status = 1；
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId,ids);
        queryWrapper.eq(Setmeal::getStatus,1);

        int count = this.count(queryWrapper);
        if (count>0) {
            //如果不能删除就抛出业务异常
            throw new CustomException("套餐正在售卖中，不能删除！");

        }
        //如果可以删除，先删除套餐表中的数据----setmeal
        this.removeByIds(ids);

        //delete from setmeal_dish where setmeal_id in(*,*,*)
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);

        //再删除关系表中的数据------setmeal——dish
        setmealDishService.remove(lambdaQueryWrapper);
    }

    /**
     * 根据id查询套餐信息跟分类信息
     * @param id
     * @return
     */
    @Override
    public SetmealDto getByIdWithDish(Long id) {
        //查询套餐基本信息setmeal
        Setmeal setmeal = this.getById(id);
        SetmealDto setmealDto = new SetmealDto();

        BeanUtils.copyProperties(setmeal,setmealDto);
        //查询菜品信息setmeal_dish
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,setmeal.getId());
        List<SetmealDish> dishes = setmealDishService.list(queryWrapper);
        setmealDto.setSetmealDishes(dishes);
        return setmealDto;
    }

    /**
     *
     * @param setmealDto
     */
    @Override
    public void updateWithDish(SetmealDto setmealDto) {
       //更新setmeal表基本信息
        this.updateById(setmealDto);
        //先清理当前菜单信息setmeal_dish    delete
        //delete from setmeal_dish where setmeal_id = ????
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,setmealDto.getId());
        setmealDishService.remove(queryWrapper);

       //再更新setmeal_dish菜单表    insert
        List<SetmealDish> dishes = setmealDto.getSetmealDishes();

        dishes.stream().map((item)->{
            item.setSetmealId(setmealDto.getId());
            return item;

        }).collect(Collectors.toList());
        setmealDishService.saveBatch(dishes);
    }
}
